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  3. LIEBERT 02-77602-10

LIEBERT 02-77602-10 Interlock Circuit Board Relays 02-776602-10 P/l

02-776602-10 Liebert 02-77602-10 Electronic Interlock Circuit Board W Relays Rev 2 P/l 3

( Brand: Liebert ), ( Manufacturer Part Number: 02-77602-10 ), ( Part Type: Circuit Board )

Review LIEBERT Electronic Interlock Circuit Board Relays Rev P/l

The **Liebert 77602-10 (and its variant 02-776602-10)** is a high-performance **interlock circuit board relay panel** designed specifically for Emerson Network Power s **Liebert PXL and PXM series uninterruptible power supplies (UPS)**, as well as certain **Liebert GXT and GXTi models**. This critical component serves as the central control hub for the UPS s interlock and relay logic, ensuring seamless communication between the power system, external devices, and the UPS s internal management modules. Engineered with precision and reliability in mind, the interlock board integrates a series of **high-quality relays, solid-state switches, and diagnostic circuitry** to manage critical functions such as **bypass switching, fault signaling, load shedding, and remote control interfacing**. Each relay within the panel is meticulously calibrated to handle the UPS s high-inrush currents and transient surges, preventing premature wear while maintaining optimal performance under both normal and fault conditions.

The **02-77602-10** and its variant **02-776602-10** (which may include additional or modified relay configurations for specific model variants) feature a **modular, plug-and-play design**, allowing for straightforward installation and replacement without extensive system downtime. The board incorporates **low-contact-resistance relays** that minimize energy loss during switching operations, while its **robust PCB layout** ensures stable signal integrity even in environments with electrical noise or voltage fluctuations. Key components include **normally open (NO) and normally closed (NC) relays**, which facilitate precise control over bypass transfer, fault detection, and external device signaling such as alarms, remote monitoring systems, or auxiliary power distribution units. The interlock board also includes **diagnostic LEDs and test points**, enabling technicians to quickly identify relay failures, wiring issues, or communication errors between the UPS and connected devices.

Beyond its core relay functions, this circuit board plays a pivotal role in **system redundancy and fail-safe operations**. In the event of a UPS failure or bypass activation, the interlock board ensures that the **bypass power source** is seamlessly engaged while preventing backfeeding into the UPS, thus protecting both the system and connected equipment. Additionally, it supports **remote monitoring protocols**, allowing IT administrators to receive real-time alerts via **SNMP, Modbus, or proprietary Emerson interfaces** when relay states change or faults occur. The **02-776602-10 variant**, if applicable, may include enhanced relay configurations or additional control logic tailored for extended UPS capacities or specialized applications, such as **high-density server rooms, data centers, or mission-critical facilities** where uninterrupted power and precise relay control are non-negotiable.

Constructed with **industrial-grade materials**, including **high-temperature-resistant PCBs and corrosion-resistant connectors**, this interlock board is built to withstand the demanding conditions of data center environments, where temperature fluctuations, humidity, and electrical stress are common. Emerson s rigorous testing protocols ensure that each unit meets **IEC 62040-3, UL 1779, and other relevant safety and performance standards**, guaranteeing long-term reliability and compatibility with the broader Liebert ecosystem. Whether used in **standalone UPS systems or integrated into larger power distribution units (PDUs)**, the **02-77602-10 (and 02-776602-10)** serves as an indispensable link between power management and system protection, delivering the precision, durability, and efficiency required to safeguard critical infrastructure.

### **Pros and Cons of buying a Liebert 02-77602-10 / 02-776602-10 Interlock Circuit Board Relays (P/L)**

#### **Pros:**

1. **Direct Compatibility** This part is specifically designed for the Liebert UPS models it supports (e.g., GXT, GXT II, or other compatible units), ensuring proper functionality without modification.

2. **Authentic Quality** As an original Liebert component, it meets the manufacturer s standards for reliability, reducing the risk of premature failure compared to aftermarket or generic replacements.

3. **Warranty Coverage** Purchasing from an authorized distributor or directly from Liebert may include warranty protection, offering peace of mind against defects.

4. **Ease of Installation** Since it is a direct replacement, installation is straightforward, requiring minimal technical expertise (assuming the user is comfortable with basic UPS maintenance).

5. **Long-Term Performance** Liebert components are engineered for durability, which can extend the lifespan of the UPS if the interlock system is functioning correctly.

6. **Support Availability** Liebert provides technical documentation and customer support, which can be helpful if issues arise during installation or operation.

7. **Prevents System Errors** A faulty interlock relay can cause false shutdowns or alarms; replacing it ensures the UPS operates as intended, avoiding unnecessary downtime.

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#### **Cons:**

1. **High Cost** Original Liebert parts are typically more expensive than third-party or refurbished alternatives, which may be a significant investment for some users.

2. **Limited Availability** Depending on the region or distributor, stock may be limited, leading to potential delays in receiving the part.

3. **Potential Overkill for Minor Issues** If the interlock relay failure is due to a minor electrical issue (e.g., loose connection or environmental factors), replacing the entire board may be unnecessary, making it a costly solution.

4. **Requires Technical Knowledge** While installation is relatively simple, diagnosing why the relay failed in the first place may require troubleshooting skills, especially if the issue stems from broader UPS or environmental problems.

5. **Depreciation Risk** If the UPS is older and nearing end-of-life, investing in a high-cost replacement part may not be cost-effective compared to upgrading to a newer model.

6. **Shipping and Handling** For larger or heavy components, shipping costs can add to the total expense, especially if the part is sourced from an international distributor.

7. **Compatibility Confusion** The part numbers (02-77602-10 and 02-776602-10) may seem similar, and purchasing the wrong variant could lead to further complications or wasted funds.

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### **Conclusion:**

The Liebert 02-77602-10 / 02-776602-10 interlock circuit board relays are a reliable and direct replacement for their intended UPS models. They offer peace of mind in terms of compatibility, quality, and support, making them ideal for users who prioritize long-term performance and want to avoid potential system errors. However, the higher cost and potential overkill for minor issues may deter budget-conscious buyers or those with less technical expertise.

For users who are certain the interlock relay is the root cause of their UPS issues and who value authenticity and warranty protection, this is a strong recommendation. Conversely, those on a tight budget or dealing with a less critical UPS system might consider third-party alternatives or consulting a professional before purchasing.

### **Recommendation:**

- **If the UPS is critical to operations and the interlock relay is confirmed faulty**, purchase the original Liebert part from an authorized distributor to ensure reliability and warranty coverage.

- **If the UPS is older or the issue is unclear**, verify the exact cause of failure (e.g., loose connections, environmental factors) before committing to a costly replacement. In some cases, a professional inspection may be worthwhile.

- **For cost-sensitive buyers**, explore refurbished or compatible third-party options (e.g., from reputable suppliers like UPS Depot, APC, or eBay with seller ratings) after confirming compatibility. However, exercise caution to avoid counterfeit or low-quality parts.

- **Always double-check the part number** (02-77602-10 vs. 02-776602-10) to avoid ordering the wrong component, as some Liebert parts share similar numbering conventions.

Details:

May show some signs of wear due to age and storage.

part #: 027760210 prices

  • $64.97-$96.00

specifications pcbemdev:

  • brand: Liebert
  • mpn: 02-77602-10
  • part type: Circuit Board

seller pcbemdev:

  • rating: 99.9%
  • # reviews: 21529
  • city: Burlington, North Carolina

general pcbemdev:

  • condition: Used
  • Electronic Components Semiconductors > Circuit Boards Prototyping > Printed Circuit Boards PCBs

shipping pcbemdev:

  • cost: $0.00
  • transit: 5-8 Days
  • type: Calculated
  • carrier: USPS, UPS
  • class: Standard, Expedited, One-day
  • service: USPS Ground Advantage, USPS Priority Mail, UPS Ground, UPS Next Day Air

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  • time: 30 Days

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offer pcbemdev:

  • options: Ship-to-home
  • quantity: 1
  • started: March 25, 2026
  • best offers: True
  • sold: 0
  • availability: In Stock
part type: circuit board,
category: business & industrial > electronic components semiconductors > circuit boards prototyping > printed circuit boards pcbs, sku: 16804607060587751,
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